From fdb9970c340e04d5495651d6f19e6e61dcb14f67 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Wed, 10 Aug 2022 14:11:18 +0200
Subject: [slx-dmsetup] Handle absolute slice sizes first and remember used
 space

---
 modules.d/slx-dmsetup/scripts/dmsetup-slx-device | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/modules.d/slx-dmsetup/scripts/dmsetup-slx-device b/modules.d/slx-dmsetup/scripts/dmsetup-slx-device
index 2dcd7eb3..3551a6eb 100755
--- a/modules.d/slx-dmsetup/scripts/dmsetup-slx-device
+++ b/modules.d/slx-dmsetup/scripts/dmsetup-slx-device
@@ -57,10 +57,17 @@ handle_unit() {
 	echo "$val"
 }
 
+parse_config() {
+	local writable_device_sz="$writable_device_sz"
+	parse_config_int "$1" 0
+	parse_config_int "$1" 1
+}
+
 # global array variables storing the configuration of the partitions
 declare -ag linear snapshot thin_snapshot thin_volume
-parse_config() {
+parse_config_int() {
 	[ -z "$1" ] && return 1
+	local -i rel_only="$2"
 	while IFS= read -r line || [ -n "$line" ]; do
 		[ -z "$line" ] && continue
 		read -r type name range crypt ignore <<< "$line"
@@ -84,6 +91,12 @@ parse_config() {
 		local max="${BASH_REMATCH[4]:-${BASH_REMATCH[1]}}"
 		local min_unit="${BASH_REMATCH[2]:-${BASH_REMATCH[5]}}"
 		local max_unit="${BASH_REMATCH[5]:-${BASH_REMATCH[2]}}"
+		# first pass we handle absolute values unly, second pass relative ones
+		if [[ "$min_unit" = "%" || "$max_unit" = "%" ]]; then
+			[ "$rel_only" != 1 ] && continue
+		else
+			[ "$rel_only" = 1 ] && continue
+		fi
 		if [ -z "$min_unit" ]; then
 			echo "$0: WARNING: No unit given in range, assuming BYTES: $line"
 		fi
@@ -116,6 +129,10 @@ parse_config() {
 			thin_volume) thin_volume+=("${name} ${crypt} ${min} ${max}") ;;
 			*) echo "$0: SOMETHING NOT GOOT CHECK SOURCE CODE" ;;
 		esac
+		# Decrease for upcoming calculations if we used fixed values here
+		if [ "$rel_only" != 1 ]; then
+			(( writable_device_sz -= ( min + max ) / 2 ))
+		fi
 	done <<< "$1"
 }
 
@@ -638,7 +655,7 @@ fi
 
 writable_device_used_sz="$scratch_device_sz"
 
-# first setup linear slices of the writable device
+# setup linear slices of the writable device
 for line in "${linear[@]}"; do
 	[ -z "$line" ] && continue
 	read -r name crypt min max ignore <<< "$line"
-- 
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